Improvement in head-blocks foe



@auch faire getest @frn Letters Patent No. 7,`588, dated February 18,18.68.

IMPROVEMENT IN HEAD-BLOCKS FORLSAW-MILLS.

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TO ALL WHOM IT MAY-CONCERIT:`

Be it known that I, BENJAMIN P. PERRY, ofthe city of Richmond, county ofWayne, and State of Indiana, have invented a new and useful Improvementin Head-Blocks for Saw-Mills; and I do hereby declare that the followingis' a full; clear, and exact description ofthe sameQreference being hadto the accompanying drawings, making a part of this specioation, inwhich- Figure l isl a. perspective view.

Figure 2, a side elevation.

Figure 3, a longitudinal section.

,Figure 4, a transverse section'.

Figure 5, a view of a portion of the devices separate from the block.

The same letters in the dierent figures relate to correspon-ding partsof the invention.

To enable 'others skilledV in the art to make and use my invention, Iwill proceed to describe its construction and operation. Y

The block or structure is composed of the sides A and A', and ends D andD', and cap B, secured together in a substantial manner, with screws orotherwise. C represents a rack, having channelled sides t t', that slideon the inner edges of cap B. represents a pinion, for operating therack, and K represents a ratchet, on same shaft with pinion I. arepresents a sleeve, with journal-bcarings in the sides A and A', and isprov'idedwith an angular orifice, through which the square shaft bpasses. N, X, and V are ears, attached to said sleeve, and

vona corresponding surface ofthe latter, in the spaces thus formed bythe ears, are secured the ends of the pawls P and P', in the followingmanner: S and S' are rungs, having journal-bearings respectively in carsN and X and X and V, and are screw-tapped transversely, into which arescrewed the ends of the pawls,vthe latter lbeing provided with suitablethread for that purpose. M represents an elliptical disk, attached tothe thimble g, which latter is inserted through the side A' of theblock, having attached to its outer end-the lever e, by which saidelliptic is operated. The shaft J, to which pinion I and ratchet K areconnected, has a hearing of the end, r, in the cavity of thimble g,the`.`other end of said shaft having a bearing in the side A of theblock. The springs y and y' serve to keep the pawls to their placesonthe ratchet.' The ends of said pawls that `engage with the ratchet arewider than the latter, and extend over the elliptic, M. The pawls P andP' are operated by lever nl, and move simultaneously in the samedirectionfin consequence of their both being connected with the sleevea, on the same side of the latter, 4thus making each stroke of thehand-leverl operative, resulting in almost a continuous Vmotion-of thcfeed. l-I represents a collet on the end of shaft b, having .aprojection or stop, 7L, which latter (as the shaft is operated by leverd) strikes alternately the ecccntri'cs n and n', the object of which isto regulate Athe throw of the pawls, and thus, by changing theeccentrics with their longest ior shortest radius to the stop 7i, thefeedis adjusted. The aforesaid eccentrics areA secured to the side oftheblocks by screws, or in any convenient manner for changing theirposition. -The longest diameter of the elliptic, M, is greater than thediameter of the ratchet K, by which means, as the said elliptic isturned, with'its ends in a vertical position, the pawls are thrown outof gear with ratchet K, which permits rack C to be moved freely back andforth. l

In the operation of sawing, the ends ot'i the log rest on `thc blocks,and against tbe vertical end-'Gr of the rack, where it is held by meansof a dog attached to the rack, and which is Vmade to clasp said log,thus preventing the latter from rolling while being Vfed to .the saw.

Having ,thus fully described my said invention, what I claim, andv-desirc to secure by Letters Patent, is-

1. I claim connecting the pawls P and I" with the sleeve a on the sameside of the latter, by which a simultaneous action nf said pawls isproduced, Vresulting in the alternate operation on the ratchet,substantially as set forth. Y

2. I claim the collet H, having the projection h, in combination withthe cccentri/cs n and n', for adjusting the feed, substantially as setforth.'

` BENJAMIN P. PERRY.

Witnesses :v

JOSEPH RIDGE, WM. R. WEBSTER.

